The Hegemony Consul sat on the balcony of his ebony spaceship and played Rachmaninoff’s Prelude in C-sharp Minor on an ancient but well-maintained Steinway while great, green, saurian things surged and bellowed in the swamps below.

One I’ve recently re-read. Not quite as catchy as some of the others here, but manages to capture the world and mood of the setting remarkably well in just one sentence.